package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService
{
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额数据统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end)
    {
        //存放日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end))
        {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每日营业额
        List<Double> turnoverList = new ArrayList<>();

        for(LocalDate date : dateList)
        {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);

            //如果营业额为空
            turnover = turnover == null ? 0.0 : turnover;

            turnoverList.add(turnover);
        }

        TurnoverReportVO turnoverReportVO = TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
        return turnoverReportVO;
    }

    /**
     * 用户数据统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end)
    {
        //存放日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end))
        {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放总用户
        List<Integer> totalUserList = new ArrayList<>();
        //存放每日新增用户
        List<Integer> newUserList = new ArrayList<>();

        for(LocalDate date : dateList)
        {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();

            map.put("end",endTime);
            Integer totalUser = orderMapper.CountUserByMap(map);    //total
            map.put("begin",beginTime);
            Integer newUser = orderMapper.CountUserByMap(map);      //new


            //如果新增用户为空
            newUser = newUser == null ? 0 : newUser;
            //如果总用户为空
            totalUser = totalUser == null ? 0 : totalUser;

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        UserReportVO userReportVO = UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();

        return userReportVO;
    }

    /**
     * 订单数据统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end)
    {
        //存放日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end))
        {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放总订单数量
        List<Integer> totalOrderList = new ArrayList<>();
        Integer totalOrderNum=0;
        //存放有效订单数量
        List<Integer> validOrderList = new ArrayList<>();
        Integer validOrderNum=0;

        for(LocalDate date : dateList)
        {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();

            map.put("end",endTime);
            map.put("begin",beginTime);
            Integer totalOrder = orderMapper.CountOrderByMap(map);
            map.put("status",Orders.COMPLETED);
            Integer validOrder = orderMapper.CountOrderByMap(map);

            //如果总订单数量为空
            totalOrder = totalOrder == null ? 0 : totalOrder;

            //如果有效订单数量为空
            validOrder = validOrder == null ? 0 : validOrder;

            totalOrderNum+=totalOrder;
            totalOrderList.add(totalOrder);

            validOrderNum+=validOrder;
            validOrderList.add(validOrder);
        }

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderNum != 0)
        {
            orderCompletionRate = validOrderNum.doubleValue() / totalOrderNum.doubleValue();
        }

        OrderReportVO orderReportVO = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(totalOrderList,","))
                .validOrderCountList(StringUtils.join(validOrderList,","))
                .totalOrderCount(totalOrderNum)
                .validOrderCount(validOrderNum)
                .orderCompletionRate(orderCompletionRate)
                .build();

        return orderReportVO;
    }

    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10Statistics(LocalDate begin, LocalDate end)
    {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop(beginTime,endTime);

        List<String> names = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");

        List<Integer> numbers = goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");

        SalesTop10ReportVO salesTop10ReportVO = SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();

        return salesTop10ReportVO;
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessDate(HttpServletResponse response)
    {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
